As prices drop, lower efficiency PV modules require higher discounting
Please also see
Understanding Thin Film Prices: A Dummy’s Guide
Yes, they have to be cheaper than crystalline modules. But by how much?
http://www.greentechmedia.com/articles/read/what-governs-thin-film-module-prices/ 
Source: National Renewable Energy Laboratory (NREL), GTM Research
Source: juwi Solar, GTM Research
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